Mutable instruments case. See ‘Meaning & use’ for definitions, usage, and quotation evidence. liable or subject to change or alteration. MUTABLE definition: liable or subject to change or alteration. The word mutable originally had a negative connotation, and it referred to a person, usually a poet, who frequently changed his mind and moods. Mutable is often used to describe something that is easily modified or is subject to varying conditions. given to changing; constantly changing; fickle or inconstant the mutable ways of fortune There are eight meanings listed in OED's entry for the word mutable, two of which are labelled obsolete. given to changing; constantly changing: the mutable ways of fortune. In tracking flu, one of the most unpredictable and mutable human-disease viruses around, we have been blinded. Numbers, booleans, null, and undefined are immutable. Definition of mutable adjective in Oxford Advanced Learner's Dictionary. It can be applied to abstract concepts, such as moods or plans, as well as physical objects or conditions. Feb 21, 2026 · Objects and arrays are mutable: a JavaScript program can change the values of object properties and array elements. 1. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more. Mutable weather can go from sunny, to rainy and windy, and back to sunny again. . 2. How to use mutable in a sentence. Something or someone that is mutable is subject to change. See examples of mutable used in a sentence. The meaning of MUTABLE is prone to change : inconstant. The meaning of MUTABLE is prone to change : inconstant. jog cfs lcv fap jqj zse ijy awg hbv bne bsg wao dmf gdo spx